Is it possible to defeat 1000 Archangels with just one Imp?

I saw somewhere on a forum that this is impossible, but I still think it's quite feasible. What do you think?

Theoretically (and on special maps) it's possible, but it won't happen in a regular online game.
My method: a hero with 1000 archers attacks a castle where a stronghold is located. In the castle, there's a hero with the Orb of the Swamp, expert in Wisdom, Earth Magic, and at least basic Artillery and Tactics, with 999 mana and 99 spell power. Spells: Explosion and Force Field.
The enemy attacks